Interface Specifications - Pro-face ST3000 Series Hardware Manual

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ST3000 Series Hardware Manual

3.1.3

Interface Specifications

This section describes the specifications of each interface of the ST Series unit.

3-6

• The serial interface of the ST Series (except AST-3211A COM2) does not have

an isolation function. When the host (PLC) unit is also not isolated, be sure to

connect the #5 SG (Signal Ground) terminal to reduce the risk of damaging the

RS232C/RS422/RS485 circuit.

• ST Series (except AST-3211A COM2) have the SG (signal ground) connection

and the FG (frame ground) connection inside. When connecting an external

device to the ST using the SG terminal, be sure to check that no short-circuit loop

is created when you setup the system.

• The same type of connector is used for COM1 and COM2 of the AST-3201A. Be

careful not to mistake one for the other. Connecting them incorrectly disables

communication.

• Connecting the RS-232C isolation unit (CA3-ISO232-01) to COM1 enables isolation if

needed.

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Ast-3201a Ast-3211a Ast-3201a-a1-d24 Ast-3211a-a1-d24